America's number one. And then Tuesday morning search crews trying to track down wreckage from flight 370 have a new game plan today using warships and planes cover a smaller more concentrated area. As one task force leader says they're throwing everything they have got at this difficult and complex task. Think she's -- send -- -- in Perth Australia with the very latest details good morning. Good morning we've just got an update from officials here and the headline is this. Search teams have not had any new contact with those underwater signals they hope for coming from Malaysia 370. -- called the Australian ship the ocean shield using this US navy -- Detected two distinct signals over the weekend that are consistent with the signal that would be sent out by an airplane's cockpit voice recorder and flight data recorder. But in the last 24 hours officials here say they have not heard any more of those -- if we. Get some -- -- rob -- transitions. We can get a better fix on the ocean full. Which will -- night -- a much more narrowly focused visual search for -- -- wreckage. If they do detect more of those -- the team will then deploy this underwater torpedo looking device called the blue -- 21. That uses sonar to map the ocean floor and in theory would help reveal the wreckage of that Boeing triple seven. Right now we're about 600 feet above the water this New Zealand airplane is one of about a dozen on the search today. The problem here is the weather and if there is any wreckage out there it's going to be a lot harder to see. Officials here admit there is still some doubt about whether those pings are actually coming from Malaysia 37 these black boxes but. They say it is their best -- yet and to expect several more days of intense action. To try and track that signal down. Clayton send LA BC news Perth Australia. -- thank you claim to stay with ABC news for the very latest on the search for flight 370 we'll have a live report coming up on Good Morning America.

This transcript has been automatically generated and may not be 100% accurate.

Search Crews Race to Find Flight 370 Before Pinging Stops

Underwater technology now used to search for missing Malaysia Flight 370.